Knives



` UNITED STATES PATENT OFFICE.

ANTHONY HANKEY AND FRANCIS STILES, JR., OF LEIOESTER, MASSACHUSETTS,ASSIGNORS TO THEMSELVES AND FREDK. S. TAYLOR.

MACHINE FOR GRINDING KNIVES.

Specication of Letters Patent No. 17,952, dated August 4, 1857.

To all whom t may concern.'

Be it known that We, ANTHONY HANKEY and FRANCIS STILEs, J r., ofLeicester, in the county of lVorcester and State of Massachusetts, haveinvented certain Improvements in Machines for Grinding Planing- Machineand ot-her Knives, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, makingpart of this specification, in which- Figure l is a plan of my machine.Fig.

' 2 is an elevation of the carriage in which the knife to be ground isclamped. Fig. 3 a section upon the line A A, of Fig. l.

Our invention has for its object to grind the faces of machine and otherlarge knives, to a perfect plane at a single operation, which objectv weeffect by clamping them in a compound carriage, so constructed andarranged that the knife maybe traversed back and forth horizontally andup and down in contact with a revolving grindstone, the face of theknife remaining constantly in a vertical plane.

To enable others skilled in the art to understand our invention and tobuild and use our machine we will proceed to describe its constructionand operation.

In the said drawings B, is the knife which is held between the jaws a,and Z), the former being fixed and the latter operated to and from theother by a screw fl. The knife is thus held clamped to a plate C, whichis hinged at the bottom c (Fig. 3) to a similar Y plate D, upon the endsof the latter are tongues c, which slide up and down in grooves 1n theupper carriage. This carriage consists of a head block E, and sidepieces F, and slides in the direction of `the arrow upon the undercarriage G. The

side pieces F, being embraced by and sliding between the side pieces R,of the carriage G. This under carriage runs upon ways I-I and istraversed back and forth by hand or otherwise. The position of the upperand under carriage with respect to each other is regulated `by thescrews f, which pass through parts of the carriage G. The head blocks E,of the upper carriage are pivoted at g, to the side pieces F.

h, is a forked arm projecting back from the head block which embraces ascrew rod rising from the carriage Gr, the upper carriage is thusallowed to slide transversely upon the carriage Gr, and the head blockE, to tilt so as to throw the knife into the required position and isheld in place when adjusted by the jam nuts m., and n. The plate C, mayalso be inclined upon its hinges c, with respect to the head block andis clamped in position by the screw z', passing through a slot in ashort arm attached to the plate C.

It now remains to describe the manner in which the knife and the platesO and D are raised and lowered in the head block as the carriage istraversed upon its ways.

I, is a hand lever pivoted at p, to the head block E, and at g, to twoarms or levers K, which vibrate around their centers in standards fw,rising from the head block and are hinged at their opposite extremitiesat fv, to the plate D. By means of these connections the knife may bevibrated up and down in a vertical plane at the will of the operator.

L is the grindstone which is revolved by power suitably applied.

Operation: The knife B, being clamped to the plate O, the plate and thehead block E, are adjusted by the screws z', and Z6, to

bring the knife into the required position with respect to thegrindstone. By means of the screws f, the upper carriage is thrownforward so as to cause the knife to bear with the required force uponthe stone. The operator now takes hold of the handle I, and works it upand down, at the same time sliding the carriage past the stone; everyportion of the face of the cutter is thus brought in contact with thestone, and the cutter is reduced to a perfect plane by a single traverseof the carriage Gr on the ways H. I/Vhen this is effected, the knife istilted either by tilting the head block on the plate O, or by thecombined motion of both as before explained, and the knife is againtraversed in contact with the stone to form the bevel S. P is a screwstop which serves to limit the upward motion of the handle I, a similarstop being attached to the head block for the purpose of limiting itsdownward mot-ion if found necessary. The ways I-I, which carry thecarriage are secured to the foundation N, which carries the stone, by awedge T, or in any other suitable manner.

It is evident that by means of the above described machine, the work forwhich it is intended may be performed much more expeditiously andperfectly than can be accoinplished by the means heretofore einployed.

Thus far We have spoken of our invention as particularly applicable togrinding knives and other similar articles, it is evident that it isequally applicable to the purpose of polishing7 Where emery or otherWheels are employed.

1We do not Wish to confine ourselves to the' precise mechanical devicesemployed for the purpose of effecting the end Which We have in view7 asit is evident that there are various ineans which are equally capable ofaccomplishing the same. For instance, the carriage may be so arranged asto be raised l ANTHONY HANKEY. FRANCIS STILES, JR.

Vit-nesses AUGUSTUS O. BUNDY, DANIEL C. TOURTILLOT.

